PDF AN6426NK Data sheet ( Hoja de datos )

Número de pieza	AN6426NK
Descripción	Hands-free Speech Network IC
Fabricantes	Panasonic Semiconductor
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No Preview Available ! ICs for Telephone AN6426NK Hands-free Speech Network IC s Overview The AN6426NK incorporates both speech network and hands-free functions. Its well designed block configura- tion allows realization of a hands-free telephone with a minimal number of components. s Features • Incorporates all the functions required of a hands-free telephone. • Incorporates all the functions required of a handset. • Complies with AC and DC impedance requirements. • Provides a wide dynamic range. • A noise detecting circuit prevents inadvertent transmis- sion. • Operation on an external power supply is available. • Each mode can be easily controlled. • A built-in loudspeaker amplifier can operated either on line voltage or an external power supply. Unit : mm 1 42 21 13.7±0.3 3 to 15° 15.3±0.25 22 0.96±0.25 4.5±0.25 4.76±0.25 +0.1 0.3 – 0.05 SDIP package with 42 pins (SDIP042-P-0600A) s Block Diagram 38 39 37 – Vrl MA2 + 40 Vrl + MA1 12 – 13 18 16 – + 17 24 28 R VB Log 27 Vrl Rec 11 Pre VB TATT 10 19 14 AP T VB Log + – Buff- er VL VCC1 VCC2 15 41 42 36 34 29 6 5 Send Power Power Power Regulator Regulator Regulator + – VCC1 Vr1 GND 35 1 Matrix Circuit 33 32 Matrix Circuit 31 30 20 21 Attenator Comp Control Vr1 – Rec.1 AP Buffer + – Rec.2 + Vr1 9 78 2 AGC – S.Amp + Vr2 3 4 25 22 23 VB RATT 26 1 1 page ICs for Telephone s Pin Descriptions 1. Hand Set Communications Block (HSu) [ Transmitter System] Microphone amplifier Input : pin3 (minus input), Output : Pin38 (collector out- put) The gain and frequency characteristics are determined by the external resistors R19 (6.8kΩ)and R20 (43kΩ), and capacitors C24 (0.068µF)and C25 (1,000pF). R21 (2.2kΩ)is a resistor for the power supply for ECM. AN6426NK 33 37 38 Transmitter selector switch Input : Pin39 (speech), Pin40 (MF, holding tone) The switch changes over transmitter input for hand set communications, transmitter input for hand-free communi- cations, and MF (Multi Frequency) input. The input impe- dance at the Pin39 is 3.9kΩ and DC is VR (Pin34) C33 (4.7µF) is a DC preventive capacitor. R22 (33kΩ) is to adjust the input to the log amplifier. which is to detect the transmission level. It attenuates the amplifier input to 3.9/(3.9+R22 (33kΩ) The input impedance at the Pin40 is 3.35kΩ and DC is VR. C34 is input through 10µF. 39 40 [Receiver System] Receiver preamplifier Input : Pin11(minus input), Output : Pin10 (collector out- put) The gain and frequency characteristics are determined by the external resistors R5 (1kΩ)and R4 (22kΩ), and capac- itors C8 (0.1µF)and C7 (3,300pF) 11 10 Receiver selector switch Input : Pin10, Pin40 The switch changes over receiver input for hand set com- munications and MF input. Receiver automatic pad Control : Pin33 Common with transmitter automatic pad Receiver buffer amplifier Output : Pin9 Outputs a receiver signal for hand-free communications at low inpedance. Transmitter automatic pad Control : Pin33 Varies the transmitter/receiver gain by the value of the current supplied to the IC. A variable point can be moved by R18 (100kΩ). Increasing R18 causes AP to start operation at a higher line current. 9 5 5 Page

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